Vehicular boom hoist



United States Patent O 3,435,961 VEHICULAR BOOM HOIST Frank C. Hamson, SouthlHouston, Tex., assignor of one-half to Billy J. Sealey, Harris County, Tex. Filed Jan. 23, 1967, Ser. No. 617,000 Int. Cl. B66c 23/ 72 U.S. Cl. 212--49 5 Claims ABSTRACT OF THE DISCLOSURE Background ofthe invention The boom hoist equipment presently in use pivots the boom at the rearward end of the vehicle, with the engine positioned rearwardly of the boom pivot and in many instances, counterweights are employed rearwardly of the boom pivot points to aid in balancing the boom. Where extra heavy loads are to be handled, difficulty is encountered in moving equipment of sufficient size over our highways, because of weight limitations. In many instances it has been necessary to sectionalize the equipment, or dismantle same, and to haul such dismantled equipment in several loads, thus consuming time in disassembly and in reassembly, as well as incuring additional labor costs. The object of this invention is to provide a boom hoist capable of handling heavier loads than its former equivalent in size and weight.

Summary of the invention A vehicular boom hoist pivotally mounted on a movable crane at a point substantially above the rear conical rollers of the turntable of the vehicle to provide a fulcrum point over the rear conical rollers, with adjustable means to provide the desired counterweight which may be adjustable to the load encountered, said boom having novel means for operation on the vehicle, and providing equipment capable of handling extra heavy loads, and that may be readily moved over the highways.

Brief description of the drawings FIGURE l is a side elevational view, showing the counterweight extended in dotted lines.

FIGURE 2 is a top plan view of the boom yoke.

FIGURE 3 is a side elevational view of another form of the invention.

FIGURE 4 is a top plan view of the form shown in FIGURES.

FIGURE 5 is a bottom view of the counterweight, showing the counterweight extended in dotted lines.

FIGURE 6 is a side elevational view of the hydraulic ram employed, and

FIGURE 7 is a cross sectional end view taken on the line 7--7 of FIGURE 5.

Description of the preferred embodiments The numeral 1 designates a vehicle such as the usual mobile crane, on which the usual turntable 2 is mounted.

ICC

A` control cab 3 is mounted on the framework of the vehicle and the usual engine and draw works (not shown) isAmounted in the machine cab 4 and to which the operating lines 5 are connected. A yoke 6 is pivotally mounted on the framework of the vehicle by means of the bearings 7, 7 and reinforced axle, 8, the axle 8 extending transversely beneath the deck 9, and passing substantially over the rear conical bearings (not shown) on which the cab 4 rotates. The usual boom 10 is mounted on the yoke 6 and the usual load carrying tool 11 is secured to the line 5.

Slidably mounted in the framework of the vehicle bene'ath the deck 9, is the counterweight 12 mounted on the runners 13, 13 within the tracks 14, 14 on the bearings 15j, 15. The counterweight 12 is moved inwardly and outwardly by any suitable means such as the hydraulic ramt-16 having the piston 17 and piston shaft 18 anchored at one end to the piston and connected at the other end to the counterweight 12.

With the boom 10 secured to the yoke 6, which is pivot'edover the rear conical rollers of the turntable of the vehicle, much greater loads may be handled by the hoist, and the load capacity may be increased by extending the counterweight outwardly from the cab. The cab, boom and counterweight will all pivot on the turntable in the usual manner.

`In the form shown in FIGURES 3 yand 4, the control cab 19 is mounted on the deck 22 and the boom 21 is pivotally mounted on the upstanding ears 2S. The control cab 19 is located adjacent the boom 21, and the drawworks (not shown) are mounted between the control cab and the storage compartment 23. The counterweight 24 is slidably mounted in the vehicle and :is operated by the vehicle operator as hereinabove described. In this form, the boom is pivoted over the rear conical rollers of the turntable of the vehicle, and in that location, is capable of picking up much more load than when located on the front of the vehicle framework, or over the forward conical rollers as is now common. The pivot points on which the boom is mounted, such as the ears 25, 25, are raised from the floor of the vehicle, so that the boom will clear the drawworks mounted between the control cab and the storage compartment.

While the foregoing are considered] preferred forms of the invention, they 'are by way of illustration only, the broad principle of the invention being defined by the appended claims.

What I claim is:

1. A boom hoist for mobile cranes comprising a vehicular framework, a turntable mounted on said framework and supporting a deck, said deck supporting a countervif/eight and cab, a pivotal yoke mounted on said deck and having a transverse axle extending beneath said deck to the rear of said turntable at the approximate center of said deck and a boom mounted on said yoke.

2. The device defined in claim 1 having a counterweight slidably mounted on said framework and extendable outwardly opposite said boom, tracks mounted on said deck, runners supporting said counterweight and mounted in said tracks.

3. The device dened in claim 1 having a counterweight slidably mounted on said framework and extendable outwardly opposite said boom tracks on said deck, runners supporting said counterweight and mounted on roller bearings in said tracks, said counterweight having hydraulic means for extending and retracting said counterweight.

4. The device delined in claim 1 wherein said transh verse axle is mounted beneath the said deck and adjacent the periphery of said turntable and substantially approximately centered with relation to the deck of said vehicle where it remains constant.

`5. In a boom hoist for mobile cranes and the like having a turntable, a counterweight and boom, said hoist having a vehicular framework and a deck mounted on a turntable having conical rollers on said framework, an enclosed control cab on said deck, said cab having an operators control panel therein, a storage compartment on said deck parallel with said cab, a boom pivotally mounted on said deck between said cab and storage compartment, and the said boom being pivotally mounted at substantially the center of said deck and adjacent the rear perimeter of the turntable.

5 References Cited UNITED STATES PATENTS 1,909,528 5/1933 Garson 212-59 2,978,115 4/1961 Prestel 212-49 10 3,160,284 12/1964 Moore 212--69 ANDRES H. NIELSEN, Primary Examiner. 

